natural gas

noun
a combustible mixture of gaseous hydrocarbons that accumulates in porous sedimentary rocks, especially those yielding petroleum, consisting usually of over 80 percent methane together with minor amounts of ethane, propane, butane, nitrogen, and, sometimes, helium: used as a fuel and to make carbon black, acetylene, and synthesis gas.

Origin:
1815–25

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Natural gas is always a great word to know.
So is bezoar. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Collins
World English Dictionary
natural gas
 
n
a gaseous mixture consisting mainly of methane trapped below ground; used extensively as a fuel

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
natural gas   (nāch'ər-əl)  Pronunciation Key 
A mixture of hydrocarbon gases that occurs naturally beneath the Earth's surface, often with or near petroleum deposits. Natural gas contains mostly of methane but also has varying amounts of ethane, propane, butane, and nitrogen. It is used as a fuel and in making organic compounds.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It is collected in the same pockets where natural gas is found, tying helium
  prices and scarcity to fuel prices.
They will include not only a rail line but also pipelines that can carry oil,
  gasoline, or liquefied natural gas.
It uses energy, primarily natural gas and natural gas derivatives, as a
  feedstock material to make a wide array of products.
There are three major forms of fossil fuels: coal, oil and natural gas.
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